Overview:Tonight, comedian Garry Shandling promotes his new DVD Not Just the Best of the Larry Sanders Show. Jon begins tonight's show with a look at Baghdad and how the Bush administration is bridging the gap between Shiites and Sunnis by building a series of walls in Baghdad in a segment called "Extreme Makeover: Baghdad Edition". Jon then talks with Baghdad Bureau Chief Aasif Mandvi about the Baghdad walls in a segment called "Wall or Nothing". Finally, Lewis Black makes fun of several Earth Day television specials in "Back in Black".